Peristaltic Flow Of Ideal Porous Media Under Ultrasound And Ultrasonic Propagation Model In The Reservoir

The technology of oil exploitation by high-power ultrasonic is mainly to study the influence on the fluid flow properties of oil reservoir after using ultrasound. Fluid-saturated porous media is a formation close to the structure of real reservoir rocks. Therefore study of ultrasound's influence on the flow pattern of saturated-flow porous medium is very important.Based on the theory of fluid mechanics and ideal parallel capillary porous media model, this paper creates the sound creeping flow model of porous media. Using perturbation analysis method, this thesis derives a mathematical expression of peristaltic net flows, and carries out the analysis of ultrasonic parameters and reservoir parameters on the properties of the net flow. Meanwhile, the paper establishes the transmission model of ultrasound in the reservoir and studies the ultrasonic propagation in the reservoir. In summary, the main contents of this paper are as follows:(1)Using the theory of ultrasonic radiation's impact on fluids in porous media by Ganiev, this paper establishes the creeping model while ultrasound deforming the pores of porous media. Taking the ratio of pore radius and amplitude of ultrasound as the small parameter, and using perturbation analysis method, the paper obtains the solution of second-order approximation formula of the net flow caused by ultrasonic creeping.(2)The paper studies the variation of non-dimensional creeping flow by carrying out analysis of the five dimensionless parametersε,α, Re , Kn andχon the impact of net flows. Using acoustic and mechanical correlated theory, we establish the relationship between the net flow and the ultrasonic parameters. Therefore we turn the non-dimensional problem into a dimensional problem. Analysis of ultrasonic power, frequency, sound source distance and the reservoir parameters on the net flows are investigated.(3)With the parallel and ideal capillary model of porous media, and considering the role of viscous fluid, the paper establishes ultrasonic propagation model in the reservoir, and obtains the ultrasonic attenuation coefficient of ultrasonic wave propagation within the reservoir. Also, analysis of Ultrasonic frequency and porosity, permeability, fluid viscosity and other reservoir parameters on the ultrasonic propagation is carried out.